问题:开发商甲公司在某城区拥有一块土地,为进行房地产开发,公司将土地抵押给A银行,并办理了土地抵押权登记。房屋完工后,甲公司又以该楼房为担保物,向B银行贷款,并办理房屋抵押登记手续,但是并未在土地管理部门办理土地抵押登记。其后,甲公司无力偿还A银行和B银行的债务,同时被两家银行要求实现抵押权。两家银行应当如何受偿? Problem: Developer A owns a piece of land in a certain urban area. For real estate development, the company mortgages the land to Bank A and handles the registration of the land mortgage. After the completion of housing, a company with the building as collateral to Bank B loans, and for the registration of housing mortgage, but not in the land management department for land mortgage registration. Later, Company A was unable to repay the debts of Bank A and Bank B and was simultaneously asked by both banks to realize the mortgage. Two banks should be how to pay?